To keep heroes out, all he wanted was to install a steel door with a deadbolt—but unfortunately, deep down, even King Koopa is just a man with a weakness.
At least that's the case in this video, in which stagefivetv give their own account of how Mario's arch-nemesis came to be the owner of his very own lava- trap- and ghost-based security system. Even though he actually hates ghosts.
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Supervillain Security Solutions [YouTube, thanks tipsters Matt Conant and John Smith!]